The trident model HS-30V Mark II is Hydrological Services latest innovation, when used in conjunction with the GCO1, the HS-30V forms a complete Hydrostatic Level Sensor for measuring water level in dams, rivers, canals and tanks with up to 30 mH2O (100 ft).
The unit has an in-built pressure transducer which allows the measurement of water to an accuracy of 0.02% F.S.

- Bubbler level sensor
- 'Ultra low power consumption (22.4mA avg lake), (40mA avg 1m (3.3ft) tidal)
- Maximum water head 30m
- In-built pressure transducer
- In-built air compressor and dryer system
- Powder coated steel enclosure
- Compact (380 x 260 x 190 mm), including protector plate
- Used in conjunction with the Gas Chamber Orifice Model GCO1
- Maintenance free for up to 5 years
- Up to 200 Metres river line